What is the best conference to attend?

I always hope to continue learning for my own faith journey, leadership, and to be a part of renewing the mainline church. One of the ways that this can be accomplished is through networking and learning at conferences. I personally recommend and will be presenting at Leadership Institute, but I am also considering the following possibilities for events to attend in 2008 and 2009.

Do you have any experience with any of these conferences? Which of these do you recommend? What other learning / leadership / conference opportunities would you suggest that are not listed here?